/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/Rigs/RigHierarchy.h
Returns a curve's value given its index
Returns true if the value is set, false otherwise.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=URigHierarchy) bool IsCurveValueSetByIndex ( int32 InElementIndex ) const